Chevy ZZ502/502 Partial Engine

GMPP offers partial engine kits for those who want the sturdy foundation of the 502 HO as the starting point of a custom engine. The ZZ502 partial engine includes forged reciprocating components, balancer, oil pan and timing chain set. You add your cylinder heads, intake, carburetor and ignition system to complete. This partial engine comes with camshaft P/N 12366543, but must be changed to camshaft P/N 24502611 to match 502 HO specifications. Use an externally balanced flywheel or flexplate.

Possible Applications

  • A stroked Rat
  • Low 11-second bracket car
  • Heavy metal hot rod

*Applications have not been validated. They are merely suggestions of how you might enjoy your GM Performance Parts crate engine. Some applications may affect engine warranty. See specific warranty information. Some applications may not be emission legal; check state and local ordinances.

Part Number: 12568782
Engine type: Chevy big-block V-8
Displacement (cu in): 502
Bore x stroke (in): 4.47 x 4.00
Block (P/N 10237292): Cast iron with 4-bolt main caps
Crankshaft (P/N 10183723): Forged steel
Connecting rods (P/N 10198922): Forged steel, shot peened
Pistons (P/N 12533507): Forged aluminum

zz 502 - 502 Partial Engine Image

Part #:12568782

Installation Notes

  • NOTE: Distributor with melonized steel gear MUST be used with long blocks and partial engines with steel camshafts, or engine damage will occur. GMPP distributor P/N 93440806 is recommended.
  • Requires addition of heads, intake, carburetor, fuel pump, starter, distributor, ignition system and other parts.
  • Intended for pre-1977 street vehicles or all off-road vehicles.
  • Not intended for marine applications.